1 /* GStreamer RTP DTMF source
2 *
3 * gstrtpdtmfsrc.c:
4 *
5 * Copyright (C) <2007> Nokia Corporation.
6 * Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
7 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
8 * 2000,2005 Wim Taymans <wim@fluendo.com>
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Library General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Library General Public License for more details.
19 *
20 * You should have received a copy of the GNU Library General Public
21 * License along with this library; if not, write to the
22 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
24 */
25
26 /**
27 * SECTION:element-rtpdtmfsrc
28 * @see_also: dtmfsrc, rtpdtmfdepay, rtpdtmfmux
29 *
30 * The RTPDTMFSrc element generates RTP DTMF (RFC 2833) event packets on request
31 * from application. The application communicates the beginning and end of a
32 * DTMF event using custom upstream gstreamer events. To report a DTMF event, an
33 * application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a
34 * structure of name "dtmf-event" with fields set according to the following
35 * table:
36 *
37 * <informaltable>
38 * <tgroup cols='4'>
39 * <colspec colname='Name' />
40 * <colspec colname='Type' />
41 * <colspec colname='Possible values' />
42 * <colspec colname='Purpose' />
43 * <thead>
44 * <row>
45 * <entry>Name</entry>
46 * <entry>GType</entry>
47 * <entry>Possible values</entry>
48 * <entry>Purpose</entry>
49 * </row>
50 * </thead>
51 * <tbody>
52 * <row>
53 * <entry>type</entry>
54 * <entry>G_TYPE_INT</entry>
55 * <entry>0-1</entry>
56 * <entry>The application uses this field to specify which of the two methods
57 * specified in RFC 2833 to use. The value should be 0 for tones and 1 for
58 * named events. Tones are specified by their frequencies and events are specied
59 * by their number. This element can only take events as input. Do not confuse
60 * with "method" which specified the output.
61 * </entry>
62 * </row>
63 * <row>
64 * <entry>number</entry>
65 * <entry>G_TYPE_INT</entry>
66 * <entry>0-15</entry>
67 * <entry>The event number.</entry>
68 * </row>
69 * <row>
70 * <entry>volume</entry>
71 * <entry>G_TYPE_INT</entry>
72 * <entry>0-36</entry>
73 * <entry>This field describes the power level of the tone, expressed in dBm0
74 * after dropping the sign. Power levels range from 0 to -63 dBm0. The range of
75 * valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE.
76 * </entry>
77 * </row>
78 * <row>
79 * <entry>start</entry>
80 * <entry>G_TYPE_BOOLEAN</entry>
81 * <entry>True or False</entry>
82 * <entry>Whether the event is starting or ending.</entry>
83 * </row>
84 * <row>
85 * <entry>method</entry>
86 * <entry>G_TYPE_INT</entry>
87 * <entry>1</entry>
88 * <entry>The method used for sending event, this element will react if this
89 * field is absent or 1.
90 * </entry>
91 * </row>
92 * </tbody>
93 * </tgroup>
94 * </informaltable>
95 *
96 * For example, the following code informs the pipeline (and in turn, the
97 * RTPDTMFSrc element inside the pipeline) about the start of an RTP DTMF named
98 * event '1' of volume -25 dBm0:
99 *
100 * <programlisting>
101 * structure = gst_structure_new ("dtmf-event",
102 * "type", G_TYPE_INT, 1,
103 * "number", G_TYPE_INT, 1,
104 * "volume", G_TYPE_INT, 25,
105 * "start", G_TYPE_BOOLEAN, TRUE, NULL);
106 *
107 * event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure);
108 * gst_element_send_event (pipeline, event);
109 * </programlisting>
110 *
111 * When a DTMF tone actually starts or stop, a "dtmf-event-processed"
112 * element #GstMessage with the same fields as the "dtmf-event"
113 * #GstEvent that was used to request the event. Also, if any event
114 * has not been processed when the element goes from the PAUSED to the
115 * READY state, then a "dtmf-event-dropped" message is posted on the
116 * #GstBus in the order that they were received.
117 */
118
119 #ifdef HAVE_CONFIG_H
120 #include "config.h"
121 #endif
122
123 #include <stdlib.h>
124 #include <string.h>
125
126 #include <glib.h>
127
128 #include "gstrtpdtmfsrc.h"
129
130 #define GST_RTP_DTMF_TYPE_EVENT 1
131 #define DEFAULT_PTIME 40 /* ms */
132 #define DEFAULT_SSRC -1
133 #define DEFAULT_PT 96
134 #define DEFAULT_TIMESTAMP_OFFSET -1
135 #define DEFAULT_SEQNUM_OFFSET -1
136 #define DEFAULT_CLOCK_RATE 8000
137
138 #define DEFAULT_PACKET_REDUNDANCY 1
139 #define MIN_PACKET_REDUNDANCY 1
140 #define MAX_PACKET_REDUNDANCY 5
141
142 GST_DEBUG_CATEGORY_STATIC (gst_rtp_dtmf_src_debug);
143 #define GST_CAT_DEFAULT gst_rtp_dtmf_src_debug
144
145 /* signals and args */
146 enum
147 {
148 /* FILL ME */
149 LAST_SIGNAL
150 };
151
152 enum
153 {
154 PROP_0,
155 PROP_SSRC,
156 PROP_TIMESTAMP_OFFSET,
157 PROP_SEQNUM_OFFSET,
158 PROP_PT,
159 PROP_CLOCK_RATE,
160 PROP_TIMESTAMP,
161 PROP_SEQNUM,
162 PROP_REDUNDANCY
163 };
164
165 static GstStaticPadTemplate gst_rtp_dtmf_src_template =
166 GST_STATIC_PAD_TEMPLATE ("src",
167 GST_PAD_SRC,
168 GST_PAD_ALWAYS,
169 GST_STATIC_CAPS ("application/x-rtp, "
170 "media = (string) \"audio\", "
171 "payload = (int) [ 96, 127 ], "
172 "clock-rate = (int) [ 0, MAX ], "
173 "encoding-name = (string) \"TELEPHONE-EVENT\"")
174 /* "events = (string) \"0-15\" */
175 );
176
177
178 G_DEFINE_TYPE (GstRTPDTMFSrc, gst_rtp_dtmf_src, GST_TYPE_BASE_SRC);
179
180 static void gst_rtp_dtmf_src_finalize (GObject * object);
181
182 static void gst_rtp_dtmf_src_set_property (GObject * object, guint prop_id,
183 const GValue * value, GParamSpec * pspec);
184 static void gst_rtp_dtmf_src_get_property (GObject * object, guint prop_id,
185 GValue * value, GParamSpec * pspec);
186 static gboolean gst_rtp_dtmf_src_handle_event (GstBaseSrc * basesrc,
187 GstEvent * event);
188 static GstStateChangeReturn gst_rtp_dtmf_src_change_state (GstElement * element,
189 GstStateChange transition);
190 static void gst_rtp_dtmf_src_add_start_event (GstRTPDTMFSrc * dtmfsrc,
191 gint event_number, gint event_volume);
192 static void gst_rtp_dtmf_src_add_stop_event (GstRTPDTMFSrc * dtmfsrc);
193
194 static gboolean gst_rtp_dtmf_src_unlock (GstBaseSrc * src);
195 static gboolean gst_rtp_dtmf_src_unlock_stop (GstBaseSrc * src);
196 static GstFlowReturn gst_rtp_dtmf_src_create (GstBaseSrc * basesrc,
197 guint64 offset, guint length, GstBuffer ** buffer);
198 static gboolean gst_rtp_dtmf_src_negotiate (GstBaseSrc * basesrc);
199 static gboolean gst_rtp_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query);
200
201
202 static void
gst_rtp_dtmf_src_class_init(GstRTPDTMFSrcClass * klass)203 gst_rtp_dtmf_src_class_init (GstRTPDTMFSrcClass * klass)
204 {
205 GObjectClass *gobject_class;
206 GstBaseSrcClass *gstbasesrc_class;
207 GstElementClass *gstelement_class;
208
209 gobject_class = G_OBJECT_CLASS (klass);
210 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
211 gstelement_class = GST_ELEMENT_CLASS (klass);
212
213 GST_DEBUG_CATEGORY_INIT (gst_rtp_dtmf_src_debug,
214 "rtpdtmfsrc", 0, "rtpdtmfsrc element");
215
216 gst_element_class_add_static_pad_template (gstelement_class,
217 &gst_rtp_dtmf_src_template);
218
219 gst_element_class_set_static_metadata (gstelement_class,
220 "RTP DTMF packet generator", "Source/Network",
221 "Generates RTP DTMF packets", "Zeeshan Ali <zeeshan.ali@nokia.com>");
222
223 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_finalize);
224 gobject_class->set_property =
225 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_set_property);
226 gobject_class->get_property =
227 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_get_property);
228
229 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMESTAMP,
230 g_param_spec_uint ("timestamp", "Timestamp",
231 "The RTP timestamp of the last processed packet",
232 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
233 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM,
234 g_param_spec_uint ("seqnum", "Sequence number",
235 "The RTP sequence number of the last processed packet",
236 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
237 g_object_class_install_property (G_OBJECT_CLASS (klass),
238 PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset",
239 "Timestamp Offset",
240 "Offset to add to all outgoing timestamps (-1 = random)", -1,
241 G_MAXINT, DEFAULT_TIMESTAMP_OFFSET,
242 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
243 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET,
244 g_param_spec_int ("seqnum-offset", "Sequence number Offset",
245 "Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT,
246 DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
247 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_CLOCK_RATE,
248 g_param_spec_uint ("clock-rate", "clockrate",
249 "The clock-rate at which to generate the dtmf packets",
250 0, G_MAXUINT, DEFAULT_CLOCK_RATE,
251 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
252 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
253 g_param_spec_uint ("ssrc", "SSRC",
254 "The SSRC of the packets (-1 == random)",
255 0, G_MAXUINT, DEFAULT_SSRC,
256 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
257 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PT,
258 g_param_spec_uint ("pt", "payload type",
259 "The payload type of the packets",
260 0, 0x80, DEFAULT_PT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
261 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_REDUNDANCY,
262 g_param_spec_uint ("packet-redundancy", "Packet Redundancy",
263 "Number of packets to send to indicate start and stop dtmf events",
264 MIN_PACKET_REDUNDANCY, MAX_PACKET_REDUNDANCY,
265 DEFAULT_PACKET_REDUNDANCY,
266 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
267
268 gstelement_class->change_state =
269 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_change_state);
270
271 gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_unlock);
272 gstbasesrc_class->unlock_stop =
273 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_unlock_stop);
274
275 gstbasesrc_class->event = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_handle_event);
276 gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_create);
277 gstbasesrc_class->negotiate = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_negotiate);
278 gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_rtp_dtmf_src_query);
279 }
280
281 static void
gst_rtp_dtmf_src_event_free(GstRTPDTMFSrcEvent * event)282 gst_rtp_dtmf_src_event_free (GstRTPDTMFSrcEvent * event)
283 {
284 if (event) {
285 if (event->payload)
286 g_slice_free (GstRTPDTMFPayload, event->payload);
287 g_slice_free (GstRTPDTMFSrcEvent, event);
288 }
289 }
290
291 static void
gst_rtp_dtmf_src_init(GstRTPDTMFSrc * object)292 gst_rtp_dtmf_src_init (GstRTPDTMFSrc * object)
293 {
294 gst_base_src_set_format (GST_BASE_SRC (object), GST_FORMAT_TIME);
295 gst_base_src_set_live (GST_BASE_SRC (object), TRUE);
296
297 object->ssrc = DEFAULT_SSRC;
298 object->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
299 object->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
300 object->pt = DEFAULT_PT;
301 object->clock_rate = DEFAULT_CLOCK_RATE;
302 object->ptime = DEFAULT_PTIME;
303 object->packet_redundancy = DEFAULT_PACKET_REDUNDANCY;
304
305 object->event_queue =
306 g_async_queue_new_full ((GDestroyNotify) gst_rtp_dtmf_src_event_free);
307 object->payload = NULL;
308
309 GST_DEBUG_OBJECT (object, "init done");
310 }
311
312 static void
gst_rtp_dtmf_src_finalize(GObject * object)313 gst_rtp_dtmf_src_finalize (GObject * object)
314 {
315 GstRTPDTMFSrc *dtmfsrc;
316
317 dtmfsrc = GST_RTP_DTMF_SRC (object);
318
319 if (dtmfsrc->event_queue) {
320 g_async_queue_unref (dtmfsrc->event_queue);
321 dtmfsrc->event_queue = NULL;
322 }
323
324
325 G_OBJECT_CLASS (gst_rtp_dtmf_src_parent_class)->finalize (object);
326 }
327
328 static gboolean
gst_rtp_dtmf_src_handle_dtmf_event(GstRTPDTMFSrc * dtmfsrc,const GstStructure * event_structure)329 gst_rtp_dtmf_src_handle_dtmf_event (GstRTPDTMFSrc * dtmfsrc,
330 const GstStructure * event_structure)
331 {
332 gint event_type;
333 gboolean start;
334 gint method;
335 GstClockTime last_stop;
336 gint event_number;
337 gint event_volume;
338 gboolean correct_order;
339
340 if (!gst_structure_get_int (event_structure, "type", &event_type) ||
341 !gst_structure_get_boolean (event_structure, "start", &start) ||
342 event_type != GST_RTP_DTMF_TYPE_EVENT)
343 goto failure;
344
345 if (gst_structure_get_int (event_structure, "method", &method)) {
346 if (method != 1) {
347 goto failure;
348 }
349 }
350
351 if (start)
352 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
353 !gst_structure_get_int (event_structure, "volume", &event_volume))
354 goto failure;
355
356 GST_OBJECT_LOCK (dtmfsrc);
357 if (gst_structure_get_clock_time (event_structure, "last-stop", &last_stop))
358 dtmfsrc->last_stop = last_stop;
359 else
360 dtmfsrc->last_stop = GST_CLOCK_TIME_NONE;
361 correct_order = (start != dtmfsrc->last_event_was_start);
362 dtmfsrc->last_event_was_start = start;
363 GST_OBJECT_UNLOCK (dtmfsrc);
364
365 if (!correct_order)
366 goto failure;
367
368 if (start) {
369 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
370 !gst_structure_get_int (event_structure, "volume", &event_volume))
371 goto failure;
372
373 GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d",
374 event_number, event_volume);
375 gst_rtp_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume);
376 }
377
378 else {
379 GST_DEBUG_OBJECT (dtmfsrc, "Received stop event");
380 gst_rtp_dtmf_src_add_stop_event (dtmfsrc);
381 }
382
383 return TRUE;
384 failure:
385 return FALSE;
386 }
387
388 static gboolean
gst_rtp_dtmf_src_handle_custom_upstream(GstRTPDTMFSrc * dtmfsrc,GstEvent * event)389 gst_rtp_dtmf_src_handle_custom_upstream (GstRTPDTMFSrc * dtmfsrc,
390 GstEvent * event)
391 {
392 gboolean result = FALSE;
393 gchar *struct_str;
394 const GstStructure *structure;
395
396 GstState state;
397 GstStateChangeReturn ret;
398
399 ret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0);
400 if (ret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) {
401 GST_DEBUG_OBJECT (dtmfsrc, "Received event while not in PLAYING state");
402 goto ret;
403 }
404
405 GST_DEBUG_OBJECT (dtmfsrc, "Received event is of our interest");
406 structure = gst_event_get_structure (event);
407 struct_str = gst_structure_to_string (structure);
408 GST_DEBUG_OBJECT (dtmfsrc, "Event has structure %s", struct_str);
409 g_free (struct_str);
410 if (structure && gst_structure_has_name (structure, "dtmf-event"))
411 result = gst_rtp_dtmf_src_handle_dtmf_event (dtmfsrc, structure);
412
413 ret:
414 return result;
415 }
416
417 static gboolean
gst_rtp_dtmf_src_handle_event(GstBaseSrc * basesrc,GstEvent * event)418 gst_rtp_dtmf_src_handle_event (GstBaseSrc * basesrc, GstEvent * event)
419 {
420 GstRTPDTMFSrc *dtmfsrc;
421 gboolean result = FALSE;
422
423 dtmfsrc = GST_RTP_DTMF_SRC (basesrc);
424
425 GST_DEBUG_OBJECT (dtmfsrc, "Received an event on the src pad");
426 if (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_UPSTREAM) {
427 result = gst_rtp_dtmf_src_handle_custom_upstream (dtmfsrc, event);
428 }
429
430 return result;
431 }
432
433 static void
gst_rtp_dtmf_src_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)434 gst_rtp_dtmf_src_set_property (GObject * object, guint prop_id,
435 const GValue * value, GParamSpec * pspec)
436 {
437 GstRTPDTMFSrc *dtmfsrc;
438
439 dtmfsrc = GST_RTP_DTMF_SRC (object);
440
441 switch (prop_id) {
442 case PROP_TIMESTAMP_OFFSET:
443 dtmfsrc->ts_offset = g_value_get_int (value);
444 break;
445 case PROP_SEQNUM_OFFSET:
446 dtmfsrc->seqnum_offset = g_value_get_int (value);
447 break;
448 case PROP_CLOCK_RATE:
449 dtmfsrc->clock_rate = g_value_get_uint (value);
450 dtmfsrc->dirty = TRUE;
451 break;
452 case PROP_SSRC:
453 dtmfsrc->ssrc = g_value_get_uint (value);
454 break;
455 case PROP_PT:
456 dtmfsrc->pt = g_value_get_uint (value);
457 dtmfsrc->dirty = TRUE;
458 break;
459 case PROP_REDUNDANCY:
460 dtmfsrc->packet_redundancy = g_value_get_uint (value);
461 break;
462 default:
463 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
464 break;
465 }
466 }
467
468 static void
gst_rtp_dtmf_src_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)469 gst_rtp_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
470 GParamSpec * pspec)
471 {
472 GstRTPDTMFSrc *dtmfsrc;
473
474 dtmfsrc = GST_RTP_DTMF_SRC (object);
475
476 switch (prop_id) {
477 case PROP_TIMESTAMP_OFFSET:
478 g_value_set_int (value, dtmfsrc->ts_offset);
479 break;
480 case PROP_SEQNUM_OFFSET:
481 g_value_set_int (value, dtmfsrc->seqnum_offset);
482 break;
483 case PROP_CLOCK_RATE:
484 g_value_set_uint (value, dtmfsrc->clock_rate);
485 break;
486 case PROP_SSRC:
487 g_value_set_uint (value, dtmfsrc->ssrc);
488 break;
489 case PROP_PT:
490 g_value_set_uint (value, dtmfsrc->pt);
491 break;
492 case PROP_TIMESTAMP:
493 g_value_set_uint (value, dtmfsrc->rtp_timestamp);
494 break;
495 case PROP_SEQNUM:
496 g_value_set_uint (value, dtmfsrc->seqnum);
497 break;
498 case PROP_REDUNDANCY:
499 g_value_set_uint (value, dtmfsrc->packet_redundancy);
500 break;
501 default:
502 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
503 break;
504 }
505 }
506
507 static gboolean
gst_rtp_dtmf_prepare_timestamps(GstRTPDTMFSrc * dtmfsrc)508 gst_rtp_dtmf_prepare_timestamps (GstRTPDTMFSrc * dtmfsrc)
509 {
510 GstClockTime last_stop;
511
512 GST_OBJECT_LOCK (dtmfsrc);
513 last_stop = dtmfsrc->last_stop;
514 GST_OBJECT_UNLOCK (dtmfsrc);
515
516 if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
517 dtmfsrc->start_timestamp = last_stop;
518 } else {
519 GstClock *clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
520
521 if (clock == NULL)
522 return FALSE;
523
524 dtmfsrc->start_timestamp = gst_clock_get_time (clock)
525 - gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
526 gst_object_unref (clock);
527 }
528
529 /* If the last stop was in the past, then lets add the buffers together */
530 if (dtmfsrc->start_timestamp < dtmfsrc->timestamp)
531 dtmfsrc->start_timestamp = dtmfsrc->timestamp;
532
533 dtmfsrc->timestamp = dtmfsrc->start_timestamp;
534
535 dtmfsrc->rtp_timestamp = dtmfsrc->ts_base +
536 gst_util_uint64_scale_int (gst_segment_to_running_time (&GST_BASE_SRC
537 (dtmfsrc)->segment, GST_FORMAT_TIME, dtmfsrc->timestamp),
538 dtmfsrc->clock_rate, GST_SECOND);
539
540 return TRUE;
541 }
542
543
544 static void
gst_rtp_dtmf_src_add_start_event(GstRTPDTMFSrc * dtmfsrc,gint event_number,gint event_volume)545 gst_rtp_dtmf_src_add_start_event (GstRTPDTMFSrc * dtmfsrc, gint event_number,
546 gint event_volume)
547 {
548
549 GstRTPDTMFSrcEvent *event = g_slice_new0 (GstRTPDTMFSrcEvent);
550 event->event_type = RTP_DTMF_EVENT_TYPE_START;
551
552 event->payload = g_slice_new0 (GstRTPDTMFPayload);
553 event->payload->event = CLAMP (event_number, MIN_EVENT, MAX_EVENT);
554 event->payload->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME);
555
556 g_async_queue_push (dtmfsrc->event_queue, event);
557 }
558
559 static void
gst_rtp_dtmf_src_add_stop_event(GstRTPDTMFSrc * dtmfsrc)560 gst_rtp_dtmf_src_add_stop_event (GstRTPDTMFSrc * dtmfsrc)
561 {
562
563 GstRTPDTMFSrcEvent *event = g_slice_new0 (GstRTPDTMFSrcEvent);
564 event->event_type = RTP_DTMF_EVENT_TYPE_STOP;
565
566 g_async_queue_push (dtmfsrc->event_queue, event);
567 }
568
569
570 static void
gst_rtp_dtmf_prepare_rtp_headers(GstRTPDTMFSrc * dtmfsrc,GstRTPBuffer * rtpbuf)571 gst_rtp_dtmf_prepare_rtp_headers (GstRTPDTMFSrc * dtmfsrc,
572 GstRTPBuffer * rtpbuf)
573 {
574 gst_rtp_buffer_set_ssrc (rtpbuf, dtmfsrc->current_ssrc);
575 gst_rtp_buffer_set_payload_type (rtpbuf, dtmfsrc->pt);
576 /* Only the very first packet gets a marker */
577 if (dtmfsrc->first_packet) {
578 gst_rtp_buffer_set_marker (rtpbuf, TRUE);
579 } else if (dtmfsrc->last_packet) {
580 dtmfsrc->payload->e = 1;
581 }
582
583 dtmfsrc->seqnum++;
584 gst_rtp_buffer_set_seq (rtpbuf, dtmfsrc->seqnum);
585
586 /* timestamp of RTP header */
587 gst_rtp_buffer_set_timestamp (rtpbuf, dtmfsrc->rtp_timestamp);
588 }
589
590 static GstBuffer *
gst_rtp_dtmf_src_create_next_rtp_packet(GstRTPDTMFSrc * dtmfsrc)591 gst_rtp_dtmf_src_create_next_rtp_packet (GstRTPDTMFSrc * dtmfsrc)
592 {
593 GstBuffer *buf;
594 GstRTPDTMFPayload *payload;
595 GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
596
597 buf = gst_rtp_buffer_new_allocate (sizeof (GstRTPDTMFPayload), 0, 0);
598
599 gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtpbuffer);
600
601 gst_rtp_dtmf_prepare_rtp_headers (dtmfsrc, &rtpbuffer);
602
603 /* timestamp and duration of GstBuffer */
604 /* Redundant buffer have no duration ... */
605 if (dtmfsrc->redundancy_count > 1)
606 GST_BUFFER_DURATION (buf) = 0;
607 else
608 GST_BUFFER_DURATION (buf) = dtmfsrc->ptime * GST_MSECOND;
609 GST_BUFFER_PTS (buf) = dtmfsrc->timestamp;
610
611 payload = (GstRTPDTMFPayload *) gst_rtp_buffer_get_payload (&rtpbuffer);
612
613 /* copy payload and convert to network-byte order */
614 memmove (payload, dtmfsrc->payload, sizeof (GstRTPDTMFPayload));
615
616 payload->duration = g_htons (payload->duration);
617
618 if (dtmfsrc->redundancy_count <= 1 && dtmfsrc->last_packet) {
619 GstClockTime inter_digit_interval = MIN_INTER_DIGIT_INTERVAL;
620
621 if (inter_digit_interval % dtmfsrc->ptime != 0)
622 inter_digit_interval += dtmfsrc->ptime -
623 (MIN_INTER_DIGIT_INTERVAL % dtmfsrc->ptime);
624
625 GST_BUFFER_DURATION (buf) += inter_digit_interval * GST_MSECOND;
626 }
627
628 GST_LOG_OBJECT (dtmfsrc, "Creating new buffer with event %u duration "
629 " gst: %" GST_TIME_FORMAT " at %" GST_TIME_FORMAT "(rtp ts:%u dur:%u)",
630 dtmfsrc->payload->event, GST_TIME_ARGS (GST_BUFFER_DURATION (buf)),
631 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), dtmfsrc->rtp_timestamp,
632 dtmfsrc->payload->duration);
633
634 /* duration of DTMF payloadfor the NEXT packet */
635 /* not updated for redundant packets */
636 if (dtmfsrc->redundancy_count <= 1)
637 dtmfsrc->payload->duration += dtmfsrc->ptime * dtmfsrc->clock_rate / 1000;
638
639 if (GST_CLOCK_TIME_IS_VALID (dtmfsrc->timestamp))
640 dtmfsrc->timestamp += GST_BUFFER_DURATION (buf);
641
642 gst_rtp_buffer_unmap (&rtpbuffer);
643
644 return buf;
645 }
646
647 static GstMessage *
gst_dtmf_src_prepare_message(GstRTPDTMFSrc * dtmfsrc,const gchar * message_name,GstRTPDTMFSrcEvent * event)648 gst_dtmf_src_prepare_message (GstRTPDTMFSrc * dtmfsrc,
649 const gchar * message_name, GstRTPDTMFSrcEvent * event)
650 {
651 GstStructure *s;
652
653 switch (event->event_type) {
654 case RTP_DTMF_EVENT_TYPE_START:
655 s = gst_structure_new (message_name,
656 "type", G_TYPE_INT, 1,
657 "method", G_TYPE_INT, 1,
658 "start", G_TYPE_BOOLEAN, TRUE,
659 "number", G_TYPE_INT, event->payload->event,
660 "volume", G_TYPE_INT, event->payload->volume, NULL);
661 break;
662 case RTP_DTMF_EVENT_TYPE_STOP:
663 s = gst_structure_new (message_name,
664 "type", G_TYPE_INT, 1, "method", G_TYPE_INT, 1,
665 "start", G_TYPE_BOOLEAN, FALSE, NULL);
666 break;
667 case RTP_DTMF_EVENT_TYPE_PAUSE_TASK:
668 return NULL;
669 default:
670 return NULL;
671 }
672
673 return gst_message_new_element (GST_OBJECT (dtmfsrc), s);
674 }
675
676 static void
gst_dtmf_src_post_message(GstRTPDTMFSrc * dtmfsrc,const gchar * message_name,GstRTPDTMFSrcEvent * event)677 gst_dtmf_src_post_message (GstRTPDTMFSrc * dtmfsrc, const gchar * message_name,
678 GstRTPDTMFSrcEvent * event)
679 {
680 GstMessage *m = gst_dtmf_src_prepare_message (dtmfsrc, message_name, event);
681
682
683 if (m)
684 gst_element_post_message (GST_ELEMENT (dtmfsrc), m);
685 }
686
687
688 static GstFlowReturn
gst_rtp_dtmf_src_create(GstBaseSrc * basesrc,guint64 offset,guint length,GstBuffer ** buffer)689 gst_rtp_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset,
690 guint length, GstBuffer ** buffer)
691 {
692 GstRTPDTMFSrcEvent *event;
693 GstRTPDTMFSrc *dtmfsrc;
694 GstClock *clock;
695 GstClockID *clockid;
696 GstClockReturn clockret;
697 GstMessage *message;
698 GQueue messages = G_QUEUE_INIT;
699
700 dtmfsrc = GST_RTP_DTMF_SRC (basesrc);
701
702 do {
703
704 if (dtmfsrc->payload == NULL) {
705 GST_DEBUG_OBJECT (dtmfsrc, "popping");
706 event = g_async_queue_pop (dtmfsrc->event_queue);
707
708 GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type);
709
710 switch (event->event_type) {
711 case RTP_DTMF_EVENT_TYPE_STOP:
712 GST_WARNING_OBJECT (dtmfsrc,
713 "Received a DTMF stop event when already stopped");
714 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
715 break;
716
717 case RTP_DTMF_EVENT_TYPE_START:
718 dtmfsrc->first_packet = TRUE;
719 dtmfsrc->last_packet = FALSE;
720 /* Set the redundancy on the first packet */
721 dtmfsrc->redundancy_count = dtmfsrc->packet_redundancy;
722 if (!gst_rtp_dtmf_prepare_timestamps (dtmfsrc))
723 goto no_clock;
724
725 g_queue_push_tail (&messages,
726 gst_dtmf_src_prepare_message (dtmfsrc, "dtmf-event-processed",
727 event));
728 dtmfsrc->payload = event->payload;
729 dtmfsrc->payload->duration =
730 dtmfsrc->ptime * dtmfsrc->clock_rate / 1000;
731 event->payload = NULL;
732 break;
733
734 case RTP_DTMF_EVENT_TYPE_PAUSE_TASK:
735 /*
736 * We're pushing it back because it has to stay in there until
737 * the task is really paused (and the queue will then be flushed
738 */
739 GST_OBJECT_LOCK (dtmfsrc);
740 if (dtmfsrc->paused) {
741 g_async_queue_push (dtmfsrc->event_queue, event);
742 goto paused_locked;
743 }
744 GST_OBJECT_UNLOCK (dtmfsrc);
745 break;
746 }
747
748 gst_rtp_dtmf_src_event_free (event);
749 } else if (!dtmfsrc->first_packet && !dtmfsrc->last_packet &&
750 (dtmfsrc->timestamp - dtmfsrc->start_timestamp) / GST_MSECOND >=
751 MIN_PULSE_DURATION) {
752 GST_DEBUG_OBJECT (dtmfsrc, "try popping");
753 event = g_async_queue_try_pop (dtmfsrc->event_queue);
754
755
756 if (event != NULL) {
757 GST_DEBUG_OBJECT (dtmfsrc, "try popped %d", event->event_type);
758
759 switch (event->event_type) {
760 case RTP_DTMF_EVENT_TYPE_START:
761 GST_WARNING_OBJECT (dtmfsrc,
762 "Received two consecutive DTMF start events");
763 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
764 break;
765
766 case RTP_DTMF_EVENT_TYPE_STOP:
767 dtmfsrc->first_packet = FALSE;
768 dtmfsrc->last_packet = TRUE;
769 /* Set the redundancy on the last packet */
770 dtmfsrc->redundancy_count = dtmfsrc->packet_redundancy;
771 g_queue_push_tail (&messages,
772 gst_dtmf_src_prepare_message (dtmfsrc, "dtmf-event-processed",
773 event));
774 break;
775
776 case RTP_DTMF_EVENT_TYPE_PAUSE_TASK:
777 /*
778 * We're pushing it back because it has to stay in there until
779 * the task is really paused (and the queue will then be flushed)
780 */
781 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
782 GST_OBJECT_LOCK (dtmfsrc);
783 if (dtmfsrc->paused) {
784 g_async_queue_push (dtmfsrc->event_queue, event);
785 goto paused_locked;
786 }
787 GST_OBJECT_UNLOCK (dtmfsrc);
788 break;
789 }
790 gst_rtp_dtmf_src_event_free (event);
791 }
792 }
793 } while (dtmfsrc->payload == NULL);
794
795
796 GST_DEBUG_OBJECT (dtmfsrc, "Processed events, now lets wait on the clock");
797
798 clock = gst_element_get_clock (GST_ELEMENT (basesrc));
799 if (!clock)
800 goto no_clock;
801 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp +
802 gst_element_get_base_time (GST_ELEMENT (dtmfsrc)));
803 gst_object_unref (clock);
804
805 GST_OBJECT_LOCK (dtmfsrc);
806 if (!dtmfsrc->paused) {
807 dtmfsrc->clockid = clockid;
808 GST_OBJECT_UNLOCK (dtmfsrc);
809
810 clockret = gst_clock_id_wait (clockid, NULL);
811
812 GST_OBJECT_LOCK (dtmfsrc);
813 if (dtmfsrc->paused)
814 clockret = GST_CLOCK_UNSCHEDULED;
815 } else {
816 clockret = GST_CLOCK_UNSCHEDULED;
817 }
818 gst_clock_id_unref (clockid);
819 dtmfsrc->clockid = NULL;
820 GST_OBJECT_UNLOCK (dtmfsrc);
821
822 while ((message = g_queue_pop_head (&messages)) != NULL)
823 gst_element_post_message (GST_ELEMENT (dtmfsrc), message);
824
825 if (clockret == GST_CLOCK_UNSCHEDULED) {
826 goto paused;
827 }
828
829 send_last:
830
831 if (dtmfsrc->dirty)
832 if (!gst_rtp_dtmf_src_negotiate (basesrc))
833 return GST_FLOW_NOT_NEGOTIATED;
834
835 /* create buffer to hold the payload */
836 *buffer = gst_rtp_dtmf_src_create_next_rtp_packet (dtmfsrc);
837
838 if (dtmfsrc->redundancy_count)
839 dtmfsrc->redundancy_count--;
840
841 /* Only the very first one has a marker */
842 dtmfsrc->first_packet = FALSE;
843
844 /* This is the end of the event */
845 if (dtmfsrc->last_packet == TRUE && dtmfsrc->redundancy_count == 0) {
846
847 g_slice_free (GstRTPDTMFPayload, dtmfsrc->payload);
848 dtmfsrc->payload = NULL;
849
850 dtmfsrc->last_packet = FALSE;
851 }
852
853 return GST_FLOW_OK;
854
855 paused_locked:
856
857 GST_OBJECT_UNLOCK (dtmfsrc);
858
859 paused:
860
861 if (dtmfsrc->payload) {
862 dtmfsrc->first_packet = FALSE;
863 dtmfsrc->last_packet = TRUE;
864 /* Set the redundanc on the last packet */
865 dtmfsrc->redundancy_count = dtmfsrc->packet_redundancy;
866 goto send_last;
867 } else {
868 return GST_FLOW_FLUSHING;
869 }
870
871 no_clock:
872 GST_ELEMENT_ERROR (dtmfsrc, STREAM, MUX, ("No available clock"),
873 ("No available clock"));
874 gst_pad_pause_task (GST_BASE_SRC_PAD (dtmfsrc));
875 return GST_FLOW_ERROR;
876 }
877
878
879 static gboolean
gst_rtp_dtmf_src_negotiate(GstBaseSrc * basesrc)880 gst_rtp_dtmf_src_negotiate (GstBaseSrc * basesrc)
881 {
882 GstCaps *srccaps, *peercaps;
883 GstRTPDTMFSrc *dtmfsrc = GST_RTP_DTMF_SRC (basesrc);
884 gboolean ret;
885
886 /* fill in the defaults, there properties cannot be negotiated. */
887 srccaps = gst_caps_new_simple ("application/x-rtp",
888 "media", G_TYPE_STRING, "audio",
889 "encoding-name", G_TYPE_STRING, "TELEPHONE-EVENT", NULL);
890
891 /* the peer caps can override some of the defaults */
892 peercaps = gst_pad_peer_query_caps (GST_BASE_SRC_PAD (basesrc), NULL);
893 if (peercaps == NULL) {
894 /* no peer caps, just add the other properties */
895 gst_caps_set_simple (srccaps,
896 "payload", G_TYPE_INT, dtmfsrc->pt,
897 "ssrc", G_TYPE_UINT, dtmfsrc->current_ssrc,
898 "timestamp-offset", G_TYPE_UINT, dtmfsrc->ts_base,
899 "clock-rate", G_TYPE_INT, dtmfsrc->clock_rate,
900 "seqnum-offset", G_TYPE_UINT, dtmfsrc->seqnum_base, NULL);
901
902 GST_DEBUG_OBJECT (dtmfsrc, "no peer caps: %" GST_PTR_FORMAT, srccaps);
903 } else {
904 GstCaps *temp;
905 GstStructure *s;
906 const GValue *value;
907 gint pt;
908 gint clock_rate;
909
910 /* peer provides caps we can use to fixate, intersect. This always returns a
911 * writable caps. */
912 temp = gst_caps_intersect (srccaps, peercaps);
913 gst_caps_unref (srccaps);
914 gst_caps_unref (peercaps);
915
916 if (!temp) {
917 GST_DEBUG_OBJECT (dtmfsrc, "Could not get intersection with peer caps");
918 return FALSE;
919 }
920
921 if (gst_caps_is_empty (temp)) {
922 GST_DEBUG_OBJECT (dtmfsrc, "Intersection with peer caps is empty");
923 gst_caps_unref (temp);
924 return FALSE;
925 }
926
927 /* now fixate, start by taking the first caps */
928 temp = gst_caps_truncate (temp);
929 temp = gst_caps_make_writable (temp);
930 srccaps = temp;
931
932 /* get first structure */
933 s = gst_caps_get_structure (srccaps, 0);
934
935 if (gst_structure_get_int (s, "payload", &pt)) {
936 /* use peer pt */
937 dtmfsrc->pt = pt;
938 GST_LOG_OBJECT (dtmfsrc, "using peer pt %d", pt);
939 } else {
940 if (gst_structure_has_field (s, "payload")) {
941 /* can only fixate if there is a field */
942 gst_structure_fixate_field_nearest_int (s, "payload", dtmfsrc->pt);
943 gst_structure_get_int (s, "payload", &pt);
944 GST_LOG_OBJECT (dtmfsrc, "using peer pt %d", pt);
945 } else {
946 /* no pt field, use the internal pt */
947 pt = dtmfsrc->pt;
948 gst_structure_set (s, "payload", G_TYPE_INT, pt, NULL);
949 GST_LOG_OBJECT (dtmfsrc, "using internal pt %d", pt);
950 }
951 }
952
953 if (gst_structure_get_int (s, "clock-rate", &clock_rate)) {
954 dtmfsrc->clock_rate = clock_rate;
955 GST_LOG_OBJECT (dtmfsrc, "using clock-rate from caps %d",
956 dtmfsrc->clock_rate);
957 } else {
958 GST_LOG_OBJECT (dtmfsrc, "using existing clock-rate %d",
959 dtmfsrc->clock_rate);
960 }
961 gst_structure_set (s, "clock-rate", G_TYPE_INT, dtmfsrc->clock_rate, NULL);
962
963
964 if (gst_structure_has_field_typed (s, "ssrc", G_TYPE_UINT)) {
965 value = gst_structure_get_value (s, "ssrc");
966 dtmfsrc->current_ssrc = g_value_get_uint (value);
967 GST_LOG_OBJECT (dtmfsrc, "using peer ssrc %08x", dtmfsrc->current_ssrc);
968 } else {
969 /* FIXME, fixate_nearest_uint would be even better */
970 gst_structure_set (s, "ssrc", G_TYPE_UINT, dtmfsrc->current_ssrc, NULL);
971 GST_LOG_OBJECT (dtmfsrc, "using internal ssrc %08x",
972 dtmfsrc->current_ssrc);
973 }
974
975 if (gst_structure_has_field_typed (s, "timestamp-offset", G_TYPE_UINT)) {
976 value = gst_structure_get_value (s, "timestamp-offset");
977 dtmfsrc->ts_base = g_value_get_uint (value);
978 GST_LOG_OBJECT (dtmfsrc, "using peer timestamp-offset %u",
979 dtmfsrc->ts_base);
980 } else {
981 /* FIXME, fixate_nearest_uint would be even better */
982 gst_structure_set (s, "timestamp-offset", G_TYPE_UINT, dtmfsrc->ts_base,
983 NULL);
984 GST_LOG_OBJECT (dtmfsrc, "using internal timestamp-offset %u",
985 dtmfsrc->ts_base);
986 }
987 if (gst_structure_has_field_typed (s, "seqnum-offset", G_TYPE_UINT)) {
988 value = gst_structure_get_value (s, "seqnum-offset");
989 dtmfsrc->seqnum_base = g_value_get_uint (value);
990 GST_LOG_OBJECT (dtmfsrc, "using peer seqnum-offset %u",
991 dtmfsrc->seqnum_base);
992 } else {
993 /* FIXME, fixate_nearest_uint would be even better */
994 gst_structure_set (s, "seqnum-offset", G_TYPE_UINT, dtmfsrc->seqnum_base,
995 NULL);
996 GST_LOG_OBJECT (dtmfsrc, "using internal seqnum-offset %u",
997 dtmfsrc->seqnum_base);
998 }
999
1000 if (gst_structure_has_field_typed (s, "ptime", G_TYPE_UINT)) {
1001 value = gst_structure_get_value (s, "ptime");
1002 dtmfsrc->ptime = g_value_get_uint (value);
1003 GST_LOG_OBJECT (dtmfsrc, "using peer ptime %u", dtmfsrc->ptime);
1004 } else if (gst_structure_has_field_typed (s, "maxptime", G_TYPE_UINT)) {
1005 value = gst_structure_get_value (s, "maxptime");
1006 dtmfsrc->ptime = g_value_get_uint (value);
1007 GST_LOG_OBJECT (dtmfsrc, "using peer maxptime as ptime %u",
1008 dtmfsrc->ptime);
1009 } else {
1010 /* FIXME, fixate_nearest_uint would be even better */
1011 gst_structure_set (s, "ptime", G_TYPE_UINT, dtmfsrc->ptime, NULL);
1012 GST_LOG_OBJECT (dtmfsrc, "using internal ptime %u", dtmfsrc->ptime);
1013 }
1014
1015
1016 GST_DEBUG_OBJECT (dtmfsrc, "with peer caps: %" GST_PTR_FORMAT, srccaps);
1017 }
1018
1019 ret = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), srccaps);
1020 gst_caps_unref (srccaps);
1021
1022 dtmfsrc->dirty = FALSE;
1023
1024 return ret;
1025
1026 }
1027
1028 static gboolean
gst_rtp_dtmf_src_query(GstBaseSrc * basesrc,GstQuery * query)1029 gst_rtp_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query)
1030 {
1031 GstRTPDTMFSrc *dtmfsrc = GST_RTP_DTMF_SRC (basesrc);
1032 gboolean res = FALSE;
1033
1034 switch (GST_QUERY_TYPE (query)) {
1035 case GST_QUERY_LATENCY:
1036 {
1037 GstClockTime latency;
1038
1039 latency = dtmfsrc->ptime * GST_MSECOND;
1040 gst_query_set_latency (query, gst_base_src_is_live (basesrc), latency,
1041 GST_CLOCK_TIME_NONE);
1042 GST_DEBUG_OBJECT (dtmfsrc, "Reporting latency of %" GST_TIME_FORMAT,
1043 GST_TIME_ARGS (latency));
1044 res = TRUE;
1045 }
1046 break;
1047 default:
1048 res = GST_BASE_SRC_CLASS (gst_rtp_dtmf_src_parent_class)->query (basesrc,
1049 query);
1050 break;
1051 }
1052
1053 return res;
1054 }
1055
1056 static void
gst_rtp_dtmf_src_ready_to_paused(GstRTPDTMFSrc * dtmfsrc)1057 gst_rtp_dtmf_src_ready_to_paused (GstRTPDTMFSrc * dtmfsrc)
1058 {
1059 if (dtmfsrc->ssrc == -1)
1060 dtmfsrc->current_ssrc = g_random_int ();
1061 else
1062 dtmfsrc->current_ssrc = dtmfsrc->ssrc;
1063
1064 if (dtmfsrc->seqnum_offset == -1)
1065 dtmfsrc->seqnum_base = g_random_int_range (0, G_MAXUINT16);
1066 else
1067 dtmfsrc->seqnum_base = dtmfsrc->seqnum_offset;
1068 dtmfsrc->seqnum = dtmfsrc->seqnum_base;
1069
1070 if (dtmfsrc->ts_offset == -1)
1071 dtmfsrc->ts_base = g_random_int ();
1072 else
1073 dtmfsrc->ts_base = dtmfsrc->ts_offset;
1074
1075 dtmfsrc->timestamp = 0;
1076 }
1077
1078 static GstStateChangeReturn
gst_rtp_dtmf_src_change_state(GstElement * element,GstStateChange transition)1079 gst_rtp_dtmf_src_change_state (GstElement * element, GstStateChange transition)
1080 {
1081 GstRTPDTMFSrc *dtmfsrc;
1082 GstStateChangeReturn result;
1083 gboolean no_preroll = FALSE;
1084 GstRTPDTMFSrcEvent *event = NULL;
1085
1086 dtmfsrc = GST_RTP_DTMF_SRC (element);
1087
1088 switch (transition) {
1089 case GST_STATE_CHANGE_READY_TO_PAUSED:
1090 gst_rtp_dtmf_src_ready_to_paused (dtmfsrc);
1091
1092 /* Flushing the event queue */
1093 while ((event = g_async_queue_try_pop (dtmfsrc->event_queue)) != NULL) {
1094 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
1095 gst_rtp_dtmf_src_event_free (event);
1096 }
1097 dtmfsrc->last_event_was_start = FALSE;
1098
1099 no_preroll = TRUE;
1100 break;
1101 default:
1102 break;
1103 }
1104
1105 if ((result =
1106 GST_ELEMENT_CLASS (gst_rtp_dtmf_src_parent_class)->change_state
1107 (element, transition)) == GST_STATE_CHANGE_FAILURE)
1108 goto failure;
1109
1110 switch (transition) {
1111 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1112 no_preroll = TRUE;
1113 break;
1114 case GST_STATE_CHANGE_PAUSED_TO_READY:
1115
1116 /* Flushing the event queue */
1117 while ((event = g_async_queue_try_pop (dtmfsrc->event_queue)) != NULL) {
1118 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
1119 gst_rtp_dtmf_src_event_free (event);
1120 }
1121 dtmfsrc->last_event_was_start = FALSE;
1122
1123 /* Indicate that we don't do PRE_ROLL */
1124 break;
1125
1126 default:
1127 break;
1128 }
1129
1130 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
1131 result = GST_STATE_CHANGE_NO_PREROLL;
1132
1133 return result;
1134
1135 /* ERRORS */
1136 failure:
1137 {
1138 GST_ERROR_OBJECT (dtmfsrc, "parent failed state change");
1139 return result;
1140 }
1141 }
1142
1143
1144 static gboolean
gst_rtp_dtmf_src_unlock(GstBaseSrc * src)1145 gst_rtp_dtmf_src_unlock (GstBaseSrc * src)
1146 {
1147 GstRTPDTMFSrc *dtmfsrc = GST_RTP_DTMF_SRC (src);
1148 GstRTPDTMFSrcEvent *event = NULL;
1149
1150 GST_DEBUG_OBJECT (dtmfsrc, "Called unlock");
1151
1152 GST_OBJECT_LOCK (dtmfsrc);
1153 dtmfsrc->paused = TRUE;
1154 if (dtmfsrc->clockid) {
1155 gst_clock_id_unschedule (dtmfsrc->clockid);
1156 }
1157 GST_OBJECT_UNLOCK (dtmfsrc);
1158
1159 GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request");
1160 event = g_slice_new0 (GstRTPDTMFSrcEvent);
1161 event->event_type = RTP_DTMF_EVENT_TYPE_PAUSE_TASK;
1162 g_async_queue_push (dtmfsrc->event_queue, event);
1163
1164 return TRUE;
1165 }
1166
1167
1168 static gboolean
gst_rtp_dtmf_src_unlock_stop(GstBaseSrc * src)1169 gst_rtp_dtmf_src_unlock_stop (GstBaseSrc * src)
1170 {
1171 GstRTPDTMFSrc *dtmfsrc = GST_RTP_DTMF_SRC (src);
1172
1173 GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped");
1174
1175 GST_OBJECT_LOCK (dtmfsrc);
1176 dtmfsrc->paused = FALSE;
1177 GST_OBJECT_UNLOCK (dtmfsrc);
1178
1179 return TRUE;
1180 }
1181
1182 gboolean
gst_rtp_dtmf_src_plugin_init(GstPlugin * plugin)1183 gst_rtp_dtmf_src_plugin_init (GstPlugin * plugin)
1184 {
1185 return gst_element_register (plugin, "rtpdtmfsrc",
1186 GST_RANK_NONE, GST_TYPE_RTP_DTMF_SRC);
1187 }
1188